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onegirl
Group Title
The cost of manufacturing x items is given by C(x) = 0.02x^2 + 20x + 1800. Find the marginal cost function. Compuare the marginal cost at x = 20 to the actual cost of producing the 20th item.
 one year ago
 one year ago
onegirl Group Title
The cost of manufacturing x items is given by C(x) = 0.02x^2 + 20x + 1800. Find the marginal cost function. Compuare the marginal cost at x = 20 to the actual cost of producing the 20th item.
 one year ago
 one year ago

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onegirl Group TitleBest ResponseYou've already chosen the best response.0
This is what i did but my teacher says it wrong. C(x) = 0.02x^2 + 20x + 1800 C’(x) = 0.04x + 20 C’(20) = 0.04(20) + 20 = 20.8 so this will be the marginal cost at x = 20 Acutal cost of the 20th item : c(20)  c(19) = 0.02(20^2) + 20(20) + 1800 – 0.02(19)^2 + 20(19) + 1800 = 4380.78
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
@agent0smith can u help?
 one year ago

julian25 Group TitleBest ResponseYou've already chosen the best response.2
c(20)c(19) = 2208  2187,22 = 20.78 it is just one algebraic mistake
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
okay thanks so thats the marginal cost?
 one year ago

julian25 Group TitleBest ResponseYou've already chosen the best response.2
no! u already got the amrginal cost "C’(20) = 0.04(20) + 20 = 20.8 so this will be the marginal cost at x = 20 "
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
ohh okay so what do i do next?
 one year ago

julian25 Group TitleBest ResponseYou've already chosen the best response.2
u wrote this "Acutal cost of the 20th item : c(20)  c(19) = 0.02(20^2) + 20(20) + 1800 – 0.02(19)^2 + 20(19) + 1800 = 4380.78 " i m telling u that part is wrong with algebraic mistakes
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
so you're saying in that its where i made my sitake?
 one year ago

julian25 Group TitleBest ResponseYou've already chosen the best response.2
i made that calculations and i got c(20)c(19) = 2208  2187,22 = 20.78
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
so how about the actual cost?
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
@Loser66 so how would i find the actual cost? should i just substitute 20 into the first problem?
 one year ago

Loser66 Group TitleBest ResponseYou've already chosen the best response.0
sorry friend, I totally lost you in this question. I don't get why you subtract C(20 ) C(19)
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
to get the marginal cost? i'm so confused :/
 one year ago

Loser66 Group TitleBest ResponseYou've already chosen the best response.0
@ganeshie8
 one year ago

Loser66 Group TitleBest ResponseYou've already chosen the best response.0
@mathstudent55
 one year ago

Loser66 Group TitleBest ResponseYou've already chosen the best response.0
I know why don't get you, hihi, it's economic problem. hand off, friend. never known before
 one year ago

julian25 Group TitleBest ResponseYou've already chosen the best response.2
hi again so what part u dont understand i think the problem is done
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
i'm trying to figure it out what is the actual cost is? since we already found marginal cost
 one year ago

julian25 Group TitleBest ResponseYou've already chosen the best response.2
u have the marginal cost C’(x) = 0.04x + 20 C’(20) = 0.04(20) + 20 = 20.8 and the actual cost of producing the 20th item. c(20)c(19) = 2208  2187,22 = 20.78 the problem says that u must compare them and u can can see they r very close
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
how how do i do that?
 one year ago

julian25 Group TitleBest ResponseYou've already chosen the best response.2
how to do what? compare them? 20.8 is very close to 20.78 u dont need to do anymore
 one year ago

onegirl Group TitleBest ResponseYou've already chosen the best response.0
okay thanks
 one year ago
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